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Non-Cash Financing and Investing Activities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]      
Non-cash acquisition of outdoor advertising assets $ 23,941    
Non-cash investing activity   4,000  
Payments for deposits   1,900  
Total purchase price   11,539  
Non-cash financing activity     0
LAMAR MEDIA CORP [Member]
     
Supplemental Disclosure Of Non Cash Investing And Financing Information [Line Items]      
Non-cash acquisition of outdoor advertising assets 23,941    
Non-cash investing activity   4,000  
Payments for deposits   1,900  
Total purchase price   11,539  
Non-cash financing activity     $ 0